Rod Mill Girth Gear And Ball Mill Girth Gear And Sag Mill Girth Gear For Sale

With more than 1000 girth gears sold over the world CITICIC Gear is a leading supplier in the cement and mineral industry. And as member of AGMA (American Gear Manufacturers Association), we do actively take part in defining the standard for gear rating calculations and service factors. 

We provide girth gears in three different designs

• Fabricated steel
  - forged ring
  - rolled plate
• Cast steel
• Ductile (Nodular) cast iron  

Fabricated gears became more common in the past and are constructed with forged steel gear rim materials and electro welded body structure. The rings are manufactured from a whole block of high resistance alloy steel. After the rough machining of the ring, we carry out hardening and tempering heat treatment in order to improve the mechanical characteristic and therefore its relevant performance.  

Avantages of fabricated girth gears

• The forged material structure excludes the risk of inclusions
• Structure defects like gas holes, micro shrinkage, pin holes, hot tears, sand and slag inclusions are avoided
• Hence, repair welding of the body structure and e.g. grinding of toothed areas is not required.
• The fabricated manufacturing procedure excludes the need for patterns and risers
• Rim material has higher hardness and higher strength than the material used for the underlying structure (i.e. web, gussets)

These features will reduce the lead time and costs. Fabricated manufacturing ensures a fast delivery.

This is especially beneficial in an emergency situation, where the existing gear rim is suffering from damage   

Features of girth gear

• External teeth
  Maximum diameter: 16000 mm
  Toothed face width: 1700 mm
  Maximum module: 45 by hob
  Maximum module: 65 gear finishing cutter
• Internal teeth
  Maximum Diameter: 6500 mm
  Maximum module: 25.4
  Toothed face width: 400 mm

Forging material process of girth gear
• Forging
• Final rolling
• Furnace cooling
• Control on production
• Water quenching
• Hardness testing
• Rough machining
• Ultrasonic testing and dimensional inspection
• Final inspection certification

Standards/Certificates of girth gear
• UNI EN ISO
• AWS
• ASTM
• ASME
• DIN
 

Applications of girth gear
Our girth gears are applied in the cement and minerals industries:
• Various types of horizontal mills
• Rotary dryers
• Rotary kilns
• Any other large gear ring application

ZTIC began in 1956-The  largest mining equipment and cement equipment manufacturers in China.CITICIC is a global supplier of technology and services to customers in the process industries,including
Mining,Construction,Metallurgical,Environmental,Power,Chemical,Marine,Casting&Forgings.
CITIC IC produces over 200,000 tons of quality equipment annually. Our products include grinding mills, scrubbers,crushers, kilns, coolers, hoists, reducers, steam turbines and compressors. CITIC IC also manufactures heavy castings and forgings, as well as electric/hydraulic control and lubrication systems.
Our factory in Luoyang covers more than 3 million square meters, of which 2 million square meters is under cover. It has a total workforce of approximately 10,000 employees of which more than 1,200 are engineers.
CITIC IC produces over 200,000 tons of quality equipment annually. Our products include grinding mills, scrubbers,crushers, kilns, coolers, hoists, reducers, steam turbines and compressors. ZTIC also manufactures heavy castings and forgings, as well as electric/hydraulic control and lubrication systems Etc.